Why would a battery go dead after new alternator install?

2005 PONTIAC GRAND AM
105,000 MILES
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REPPMOG
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I was in the process of changing out some broken/rotted windshield washer fluid line when I broke-off the possitive cable from conector to side post of batterie. I replaced the post and batterie light on dash came on. took car to have battery tested was good tested load on alternator was shown to be bad. Get new alternor installed, car starts right up, I ran it for a while wife left with it(Her car) the abs and batterylight both come on and when I tell her to start the car now battery is weak car only ran i idle for 10 minuits. Any ideas? Could I have missed a wire when fixing the battery cable?
Jan 18, 2012 at 12:02 AM
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FIXITMR
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probably blew a fuse /fusable link. test battery with car running to see if it's charging.
Jan 18, 2012 at 12:11 AM